# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FindFLTK2
---------

.. note::

  This module is specifically for FLTK version 2.x.  The 2.0 series was
  originally a development branch intended as the next major version of FLTK.
  However, it never reached stable release status, and active development has
  shifted back to the FLTK 1.x branch.  For finding FLTK, including stable and
  modern versions, use the :module:`FindFLTK` module instead.

Finds the Fast Light Toolkit (FLTK) version 2.x, a cross-platform toolkit for
GUI development:

.. code-block:: cmake

  find_package(FLTK2 [...])

Result Variables
^^^^^^^^^^^^^^^^

This module defines the following variables:

``FLTK2_FOUND``
  Boolean indicating whether FLTK 2.x is found.

``FLTK2_LIBRARIES``
  Libraries needed to link against to use FLTK 2.x.

``FLTK2_WRAP_UI``
  Boolean indicating whether the ``fluid2`` executable is found.  This variable
  can be used, for example, to conditionally invoke the :command:`fltk_wrap_ui`
  command if it is needed and available.

Cache Variables
^^^^^^^^^^^^^^^

The following cache variables may also be set:

``FLTK2_FLUID_EXECUTABLE``
  The path to the ``fluid2`` binary tool.

``FLTK2_INCLUDE_DIR``
  The directory containing header files needed to use FLTK 2.x.

``FLTK2_BASE_LIBRARY``
  The path to the FLTK 2.x library (``fltk2``).

``FLTK2_GL_LIBRARY``
  The path to the FLTK 2.x OpenGL compatibility library (``fltk2_gl``).

``FLTK2_IMAGES_LIBRARY``
  The path to the FLTK 2.x Images library (``fltk2_images``).

Examples
^^^^^^^^

Finding FLTK version 2:

.. code-block:: cmake

  find_package(FLTK2)

See Also
^^^^^^^^

* The :module:`FindFLTK` module to find FLTK in a version-agnostic way.
#]=======================================================================]

set (FLTK2_DIR $ENV{FLTK2_DIR} )

#  Platform dependent libraries required by FLTK2
if(WIN32)
  if(NOT CYGWIN)
    if(BORLAND)
      set( FLTK2_PLATFORM_DEPENDENT_LIBS import32 )
    else()
      set( FLTK2_PLATFORM_DEPENDENT_LIBS wsock32 comctl32 )
    endif()
  endif()
endif()

if(UNIX)
  include(${CMAKE_ROOT}/Modules/FindX11.cmake)
  set( FLTK2_PLATFORM_DEPENDENT_LIBS ${X11_LIBRARIES} -lm)
endif()

if(APPLE)
  set( FLTK2_PLATFORM_DEPENDENT_LIBS  "-framework Carbon -framework Cocoa -framework ApplicationServices -lz")
endif()

# If FLTK2_INCLUDE_DIR is already defined we assign its value to FLTK2_DIR
if(FLTK2_INCLUDE_DIR)
  set(FLTK2_DIR ${FLTK2_INCLUDE_DIR})
else()
  set(FLTK2_INCLUDE_DIR ${FLTK2_DIR})
endif()


# If FLTK2 has been built using CMake we try to find everything directly
set(FLTK2_DIR_STRING "directory containing FLTK2Config.cmake.  This is either the root of the build tree, or PREFIX/lib/fltk for an installation.")

# Search only if the location is not already known.
if(NOT FLTK2_DIR)
  # Get the system search path as a list.
  file(TO_CMAKE_PATH "$ENV{PATH}" FLTK2_DIR_SEARCH2)

  # Construct a set of paths relative to the system search path.
  set(FLTK2_DIR_SEARCH "")
  foreach(dir ${FLTK2_DIR_SEARCH2})
    set(FLTK2_DIR_SEARCH ${FLTK2_DIR_SEARCH} "${dir}/../lib/fltk")
  endforeach()
  string(REPLACE "//" "/" FLTK2_DIR_SEARCH "${FLTK2_DIR_SEARCH}")

  #
  # Look for an installation or build tree.
  #
  find_path(FLTK2_DIR FLTK2Config.cmake
    # Look for an environment variable FLTK2_DIR.
    ENV FLTK2_DIR

    # Look in places relative to the system executable search path.
    ${FLTK2_DIR_SEARCH}

    PATH_SUFFIXES
    fltk2
    fltk2/include
    lib/fltk2
    lib/fltk2/include

    # Help the user find it if we cannot.
    DOC "The ${FLTK2_DIR_STRING}"
    )

  if(NOT FLTK2_DIR)
    find_path(FLTK2_DIR fltk/run.h ${FLTK2_INCLUDE_SEARCH_PATH})
  endif()

endif()


# If FLTK2 was found, load the configuration file to get the rest of the
# settings.
if(FLTK2_DIR)

  # Check if FLTK2 was built using CMake
  if(EXISTS ${FLTK2_DIR}/FLTK2Config.cmake)
    set(FLTK2_BUILT_WITH_CMAKE 1)
  endif()

  if(FLTK2_BUILT_WITH_CMAKE)
    set(FLTK2_FOUND 1)
    include(${FLTK2_DIR}/FLTK2Config.cmake)

    # Fluid
    if(FLUID_COMMAND)
      set(FLTK2_FLUID_EXECUTABLE ${FLUID_COMMAND} CACHE FILEPATH "Fluid executable")
    else()
      find_program(FLTK2_FLUID_EXECUTABLE fluid2 PATHS
        ${FLTK2_EXECUTABLE_DIRS}
        ${FLTK2_EXECUTABLE_DIRS}/RelWithDebInfo
        ${FLTK2_EXECUTABLE_DIRS}/Debug
        ${FLTK2_EXECUTABLE_DIRS}/Release
        NO_SYSTEM_PATH)
    endif()

    mark_as_advanced(FLTK2_FLUID_EXECUTABLE)
    set( FLTK_FLUID_EXECUTABLE ${FLTK2_FLUID_EXECUTABLE} )




    set(FLTK2_INCLUDE_DIR ${FLTK2_DIR})
    link_directories(${FLTK2_LIBRARY_DIRS})

    set(FLTK2_BASE_LIBRARY fltk2)
    set(FLTK2_GL_LIBRARY fltk2_gl)
    set(FLTK2_IMAGES_LIBRARY fltk2_images)

    # Add the extra libraries
    load_cache(${FLTK2_DIR}
      READ_WITH_PREFIX FL
      FLTK2_USE_SYSTEM_JPEG
      FLTK2_USE_SYSTEM_PNG
      FLTK2_USE_SYSTEM_ZLIB
      )

    set(FLTK2_IMAGES_LIBS "")
    if(FLFLTK2_USE_SYSTEM_JPEG)
      set(FLTK2_IMAGES_LIBS ${FLTK2_IMAGES_LIBS} fltk2_jpeg)
    endif()
    if(FLFLTK2_USE_SYSTEM_PNG)
      set(FLTK2_IMAGES_LIBS ${FLTK2_IMAGES_LIBS} fltk2_png)
    endif()
    if(FLFLTK2_USE_SYSTEM_ZLIB)
      set(FLTK2_IMAGES_LIBS ${FLTK2_IMAGES_LIBS} fltk2_zlib)
    endif()
    set(FLTK2_IMAGES_LIBS "${FLTK2_IMAGES_LIBS}" CACHE INTERNAL
      "Extra libraries for fltk2_images library.")

  else()

    # if FLTK2 was not built using CMake
    # Find fluid executable.
    find_program(FLTK2_FLUID_EXECUTABLE fluid2 ${FLTK2_INCLUDE_DIR}/fluid)

    # Use location of fluid to help find everything else.
    set(FLTK2_INCLUDE_SEARCH_PATH "")
    set(FLTK2_LIBRARY_SEARCH_PATH "")
    if(FLTK2_FLUID_EXECUTABLE)
      set( FLTK_FLUID_EXECUTABLE ${FLTK2_FLUID_EXECUTABLE} )
      get_filename_component(FLTK2_BIN_DIR "${FLTK2_FLUID_EXECUTABLE}" PATH)
      set(FLTK2_INCLUDE_SEARCH_PATH ${FLTK2_INCLUDE_SEARCH_PATH}
        ${FLTK2_BIN_DIR}/../include ${FLTK2_BIN_DIR}/..)
      set(FLTK2_LIBRARY_SEARCH_PATH ${FLTK2_LIBRARY_SEARCH_PATH}
        ${FLTK2_BIN_DIR}/../lib)
      set(FLTK2_WRAP_UI 1)
    endif()

    find_path(FLTK2_INCLUDE_DIR fltk/run.h ${FLTK2_INCLUDE_SEARCH_PATH} PATH_SUFFIXES fltk2 fltk2/include)

    list(APPEND FLTK2_LIBRARY_SEARCH_PATH ${FLTK2_INCLUDE_DIR}/lib)

    find_library(FLTK2_BASE_LIBRARY NAMES fltk2
      PATHS ${FLTK2_LIBRARY_SEARCH_PATH} PATH_SUFFIXES fltk2 fltk2/lib)
    find_library(FLTK2_GL_LIBRARY NAMES fltk2_gl
      PATHS ${FLTK2_LIBRARY_SEARCH_PATH} PATH_SUFFIXES fltk2 fltk2/lib)
    find_library(FLTK2_IMAGES_LIBRARY NAMES fltk2_images
      PATHS ${FLTK2_LIBRARY_SEARCH_PATH} PATH_SUFFIXES fltk2 fltk2/lib)

    # Find the extra libraries needed for the fltk_images library.
    if(UNIX)
      find_program(FLTK2_CONFIG_SCRIPT fltk2-config PATHS ${FLTK2_BIN_DIR})
      if(FLTK2_CONFIG_SCRIPT)
        execute_process(COMMAND ${FLTK2_CONFIG_SCRIPT} --use-images --ldflags
          OUTPUT_VARIABLE FLTK2_IMAGES_LDFLAGS)
        set(FLTK2_LIBS_EXTRACT_REGEX ".*-lfltk2_images (.*) -lfltk2.*")
        if("${FLTK2_IMAGES_LDFLAGS}" MATCHES "${FLTK2_LIBS_EXTRACT_REGEX}")
          string(REGEX REPLACE " +" ";" FLTK2_IMAGES_LIBS "${CMAKE_MATCH_1}")
          # The execute_process() will not be inherited into subdirectories from
          # the file that originally included this module.  Save the answer.
          set(FLTK2_IMAGES_LIBS "${FLTK2_IMAGES_LIBS}" CACHE INTERNAL
            "Extra libraries for fltk_images library.")
        endif()
      endif()
    endif()

  endif()
endif()


set(FLTK2_FOUND 1)
foreach(var FLTK2_FLUID_EXECUTABLE FLTK2_INCLUDE_DIR
    FLTK2_BASE_LIBRARY FLTK2_GL_LIBRARY
    FLTK2_IMAGES_LIBRARY)
  if(NOT ${var})
    message( STATUS "${var} not found" )
    set(FLTK2_FOUND 0)
  endif()
endforeach()


if(FLTK2_FOUND)
  set(FLTK2_LIBRARIES ${FLTK2_IMAGES_LIBRARY} ${FLTK2_IMAGES_LIBS} ${FLTK2_BASE_LIBRARY} ${FLTK2_GL_LIBRARY} )
  if(APPLE)
    set(FLTK2_LIBRARIES ${FLTK2_PLATFORM_DEPENDENT_LIBS} ${FLTK2_LIBRARIES})
  else()
    set(FLTK2_LIBRARIES ${FLTK2_LIBRARIES} ${FLTK2_PLATFORM_DEPENDENT_LIBS})
  endif()

  # The following deprecated settings are for compatibility with CMake 1.4
  set (HAS_FLTK2 ${FLTK2_FOUND})
  set (FLTK2_INCLUDE_PATH ${FLTK2_INCLUDE_DIR})
  set (FLTK2_FLUID_EXE ${FLTK2_FLUID_EXECUTABLE})
  set (FLTK2_LIBRARY ${FLTK2_LIBRARIES})
else()
  # make FIND_PACKAGE friendly
  if(NOT FLTK2_FIND_QUIETLY)
    if(FLTK2_FIND_REQUIRED)
      message(FATAL_ERROR
              "FLTK2 required, please specify its location with FLTK2_DIR.")
    else()
      message(STATUS "FLTK2 was not found.")
    endif()
  endif()
endif()
